Jansson is a C library for encoding, decoding and manipulating JSON
data. Its main features and design principles are:

Simple and intuitive API and data model

Comprehensive documentation

No dependencies on other libraries

Full Unicode support (UTF-8)

Extensive test suite

Jansson is licensed under the MIT license; see LICENSE in the
source distribution for details.

Jansson is used in production and its API is stable. It works on
numerous platforms, including numerous Unix like systems and Windows.
It’s suitable for use on any system, including desktop, server, and
small embedded systems.